Malicious PDF — malware analysis report

Static analysis result for SHA-256 a680c0a2679f81e6…

MALICIOUS

PDF

37.6 KB Created: 2020-08-31 23:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e74a104df9f9e0eb920964617b89414 SHA-1: 38b60cde95ca38d5f5f199a940b12dc5d01e9986 SHA-256: a680c0a2679f81e6f467228756a1b30f1b68489a33be4a94d50ebfa9cea67866
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF file contains a heuristic firing indicating it is a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though partially corrupted, contains text related to 'vmware free for windows 7' and the malicious URL. The file also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which point to 'static.usrfiles.com'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=vmware++free+for+windows+7
    • https://static.usrfiles.com/ugd/b8c837_2b5273dffdb441f7a8ceb13b5a741aba.pdf
    • https://static.usrfiles.com/ugd/de02f3_d1186ff7f0cd4dc584d7cad7127bb9b1.pdf
    • https://static.usrfiles.com/ugd/b910ae_ce7a88c45d094e91a04b1bc73bcf26ef.pdf
    • https://static.usrfiles.com/ugd/b98abb_c6d119f9457042f7a64fae54e0e1ecff.pdf
    • https://static.usrfiles.com/ugd/b85eb0_4c78c074950645578d7266c1689a5a67.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/xonas.pdf
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/57235011803.pdf
    • https://cdn.shopify.com/s/files/1/0437/3938/1912/files/45642341514.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/vefaxuzutot.pdf
    • https://cdn.shopify.com/s/files/1/0433/5720/8731/files/76913634113.pdf
    • https://static.usrfiles.com/ugd/0f5b72_4387f8c8d9d846009c04370bb5cdfef3.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d014fd798c8423b829ce8d80b9d38f3.pdf
    • https://static.usrfiles.com/ugd/c068f8_eefa89a162f84a919caf53484aafd4ce.pdf
    • https://static.usrfiles.com/ugd/6cfc61_fbbfff14cfc64ffeaaa6cd2be5ad6cf8.pdf
    • https://static.usrfiles.com/ugd/23e9be_6a081a75edc5484bb8ca721e40ab855c.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e4f.bin
d9f2f9981382f44c2b98f506b070ac09ebc8125d8a25759dafb755bd33272c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E4F 5160 bytes
font_01_sfnt_off00005fe5.bin
766083d58e1505e5f48d6412687247ec958280228bc5232ac29478a5e51a3698		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE5 13620 bytes

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